Here's another thread on it: https://forums.sinsofasolarempire.com/?aid=337682
Other than that, have you ever sent a fleet up against two (or 3! )level 6 marzas and nothing else? heh! they get pwned by missle barrage in 10-15 secs! If you can use the abilities to their best potentail (e.g. advent holy trinity) you can turn any battle! You don't buy them for their DPS, you buy them for their sturdy hull and cool battle turning abilities, and since the first one's free (aside from the 50 supply) you got nothing to loose (exept 50 supply but a capship is worth that easilyl lol)
But if your asking about the sova and akkan specificly, not really exept for the akkan's covienient colonization and armstrise ability is a good escape tactic, makes me wish I had that earlier today, oh and aside from having 7 fighters/bombers (not untill lvl 10) sova is useless lol.
I believe sova was reduced to 6 strike craft...something I hate.
Personally, I am not too big of a Sova fan, it was tough decision to get one, let alone two but I do like how they steal money. Akkan is great, I think, it stuns and you can keep firing at the target while its stunned, no other ship does that, but its duration is so short and its super ability is very powerful.